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Table 4 Range of LA/RA area and corresponding PAOI in our study

From: Correlation of qanadli obstruction index (QOI) and atrial size on CT pulmonary angiography (CTPA) in patients with pulmonary thromboembolism

LA/RA area (range) Qanadli index & obstruction % Number of patients in study
0.72–1.21  < 10 (< 25%) 22
0.62–0.79 10–20 (25–50%) 8
0.41–0.60  > 20 (> 50%) 15